Bottom line, my question is, can you repair a shower pan liner if you are fairly certain where it is leaking?Back to the beginning, I have removed about one third of the tile and sheetrock, down to the mortar bed and shower liner. ( I had never seen or even heard of a shower liner before this, before a horrible mustysmell developed and mushrooms began to grow out of the bottom of the wall.)

The liner looks to be made out of something resembling heavy tar paper and plastic covered cardboard. It appears that the leak is in a corner. I must confess that I tore the liner about three inches from thesame corner while trying to figure out what it was. I tested the pan with the proper plug, amount of water and time. The pan and not the drain leaks.

After extensive reading, thanks in large part to wonderful on-line plumbing sites, I think I should probablyreplace the liner and the mortar bed. (I am a bit apprehensive about this undertaking.) So if I shouldn'ttry to fix the liner, but should replace everything, should I also replace the sand/concrete that is underthe liner? And if so, do you have any opinion about using Pro-Slope or any other similar product?